Thermoplastic polyester resin composition, method for producing thermoplastic polyester resin composition, and molded article

A thermoplastic polyester resin composition obtained by blending 0.1 to 50 parts by weight of (B) at least one phosphinate selected from phosphinate salts and diphosphinate salts, more than 10 parts by weight and 40 parts by weight or less of (C) a phosphazene compound, 0.1 to 50 parts by weight of (D) a nitrogen-based flame retardant, 2.5 to 6.5 parts by weight of (E) an epoxy compound, and 0.1 to 20 parts by weight of at least one resin selected from (F-1) an olefin resin and (F-2) a polyamide resin with 100 parts by weight of (A) a thermoplastic polyester resin, the thermoplastic polyester resin composition satisfying a requirement (i) below:

• (i) a total of parts by weight of the (B) at least one phosphinate selected from phosphinate salts and diphosphinate salts, parts by weight of the (C) phosphazene compound and parts by weight of the (D) nitrogen-based flame retardant ((parts by weight of the component (B) relative to 100 parts by weight of the component (A))+(parts by weight of the component (C) relative to 100 parts by weight of the component (A))+(parts by weight of the component (D) relative to 100 parts by weight of the component (A))) is 60 to 80 parts by weight.